/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.program;

import static org.hisp.dhis.category.CategoryCombo.DEFAULT_CATEGORY_COMBO_NAME;
import static org.hisp.dhis.system.deletion.DeletionVeto.ACCEPT;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import lombok.RequiredArgsConstructor;
import org.hisp.dhis.category.CategoryCombo;
import org.hisp.dhis.category.CategoryService;
import org.hisp.dhis.dataentryform.DataEntryForm;
import org.hisp.dhis.organisationunit.OrganisationUnit;
import org.hisp.dhis.system.deletion.DeletionVeto;
import org.hisp.dhis.system.deletion.IdObjectDeletionHandler;
import org.hisp.dhis.trackedentity.TrackedEntityAttribute;
import org.hisp.dhis.trackedentity.TrackedEntityType;
import org.hisp.dhis.user.UserRole;
import org.springframework.stereotype.Component;

/**
 * @author Chau Thu Tran
 */
@Component
@RequiredArgsConstructor
public class ProgramDeletionHandler extends IdObjectDeletionHandler<Program> {
  private final ProgramService programService;

  private final CategoryService categoryService;

  @Override
  protected void registerHandler() {
    whenDeleting(CategoryCombo.class, this::deleteCategoryCombo);
    whenDeleting(OrganisationUnit.class, this::deleteOrganisationUnit);
    whenDeleting(UserRole.class, this::deleteUserRole);
    whenVetoing(TrackedEntityType.class, this::allowDeleteTrackedEntityType);
    whenDeleting(TrackedEntityAttribute.class, this::deleteTrackedEntityAttribute);
    whenDeleting(DataEntryForm.class, this::deleteDataEntryForm);
  }

  private void deleteCategoryCombo(CategoryCombo categoryCombo) {
    CategoryCombo defaultCategoryCombo =
        categoryService.getCategoryComboByName(DEFAULT_CATEGORY_COMBO_NAME);

    Collection<Program> programs = idObjectManager.getAllNoAcl(Program.class);

    for (Program program : programs) {
      if (program != null && categoryCombo.equals(program.getCategoryCombo())) {
        program.setCategoryCombo(defaultCategoryCombo);
        idObjectManager.updateNoAcl(program);
      }
    }
  }

  private void deleteOrganisationUnit(OrganisationUnit unit) {
    for (Program program : unit.getPrograms()) {
      program.getOrganisationUnits().remove(unit);
      idObjectManager.updateNoAcl(program);
    }
  }

  private void deleteUserRole(UserRole group) {
    Collection<Program> programs = idObjectManager.getAllNoAcl(Program.class);

    for (Program program : programs) {
      if (program.getUserRoles().remove(group)) {
        idObjectManager.updateNoAcl(program);
      }
    }
  }

  private DeletionVeto allowDeleteTrackedEntityType(TrackedEntityType trackedEntityType) {
    Collection<Program> programs = programService.getProgramsByTrackedEntityType(trackedEntityType);

    return (programs != null && !programs.isEmpty()) ? VETO : ACCEPT;
  }

  private void deleteTrackedEntityAttribute(TrackedEntityAttribute trackedEntityAttribute) {
    Collection<Program> programs = idObjectManager.getAllNoAcl(Program.class);

    for (Program program : programs) {
      List<ProgramTrackedEntityAttribute> removeList = new ArrayList<>();

      for (ProgramTrackedEntityAttribute programAttribute : program.getProgramAttributes()) {
        if (programAttribute.getAttribute().equals(trackedEntityAttribute)) {
          removeList.add(programAttribute);
        }
      }

      if (!removeList.isEmpty()) {
        program.getProgramAttributes().removeAll(removeList);
        idObjectManager.updateNoAcl(program);
      }
    }
  }

  private void deleteDataEntryForm(DataEntryForm dataEntryForm) {
    List<Program> associatedPrograms = programService.getProgramsByDataEntryForm(dataEntryForm);

    for (Program program : associatedPrograms) {
      program.setDataEntryForm(null);
      idObjectManager.updateNoAcl(program);
    }
  }
}
